But again, these are not job interviews, they're professional licensing requirement imposed by the government, not by employers. And I don't think Facebook requires its engineers to re-interview for their own jobs every x number of years, so that's disanalogous too.

Ironically, the last thing that Facebook engineers want is for the government to regulate them. Just wait until they face the professional ethics boards. ;-) When has a programmer ever been kicked out of the industry for unethical behavior? More likely, they get promoted.